I am downloading the workbook to take a look with my performance hat on and will do my best to see what I can suggest as performance improvements.
As for the linked Tableau Public Viz the link does not seem to be working have you hidden the Viz or taken it down, maybe the link was not fully copied over from the share section of the Tableau Public Viz? I will try to test the Viz publishing from my account but of course will keep it hidden on my profile as I would not want people to think this awesome Viz is mine! Got to make sure you get your credit.
If you have not hidden it from view or removed it I can reach out to the Tableau Public team to investigate what it is not displaying.
Still not available with that link.